System for relieving secondary micro-pressure waves of high-speed railway tunnel
Method for disassembling double-layer shell shield tunneling machine in tunnel
Underground pneumatic monorail hoist and intelligent control system thereof
Combined type light ultra-soft foundation reinforcing platform and method
Environment-friendly seabed mineral resource development device and development method
Transportation sledge for under-pressure operation equipment
Oil-electricity hybrid power rope-tightening-free workover rig
Split type coal mining machine carrier and speed synchronization method
Mine plot aerial seeding vegetation recovery method based on unmanned aerial vehicle